/*
|
/*
|
* Copyright (c) 1990 The Regents of the University of California.
|
* Copyright (c) 1990 The Regents of the University of California.
|
* All rights reserved.
|
* All rights reserved.
|
*
|
*
|
* Redistribution and use in source and binary forms are permitted
|
* Redistribution and use in source and binary forms are permitted
|
* provided that the above copyright notice and this paragraph are
|
* provided that the above copyright notice and this paragraph are
|
* duplicated in all such forms and that any documentation,
|
* duplicated in all such forms and that any documentation,
|
* advertising materials, and other materials related to such
|
* advertising materials, and other materials related to such
|
* distribution and use acknowledge that the software was developed
|
* distribution and use acknowledge that the software was developed
|
* by the University of California, Berkeley. The name of the
|
* by the University of California, Berkeley. The name of the
|
* University may not be used to endorse or promote products derived
|
* University may not be used to endorse or promote products derived
|
* from this software without specific prior written permission.
|
* from this software without specific prior written permission.
|
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
|
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
|
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
|
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
|
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
|
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
|
*/
|
*/
|
|
|
/*
|
/*
|
FUNCTION
|
FUNCTION
|
<<fopen>>---open a file
|
<<fopen>>---open a file
|
|
|
INDEX
|
INDEX
|
fopen
|
fopen
|
INDEX
|
INDEX
|
_fopen_r
|
_fopen_r
|
|
|
ANSI_SYNOPSIS
|
ANSI_SYNOPSIS
|
#include <stdio.h>
|
#include <stdio.h>
|
FILE *fopen(const char *<[file]>, const char *<[mode]>);
|
FILE *fopen(const char *<[file]>, const char *<[mode]>);
|
|
|
FILE *_fopen_r(struct _reent *<[reent]>,
|
FILE *_fopen_r(struct _reent *<[reent]>,
|
const char *<[file]>, const char *<[mode]>);
|
const char *<[file]>, const char *<[mode]>);
|
|
|
TRAD_SYNOPSIS
|
TRAD_SYNOPSIS
|
#include <stdio.h>
|
#include <stdio.h>
|
FILE *fopen(<[file]>, <[mode]>)
|
FILE *fopen(<[file]>, <[mode]>)
|
char *<[file]>;
|
char *<[file]>;
|
char *<[mode]>;
|
char *<[mode]>;
|
|
|
FILE *_fopen_r(<[reent]>, <[file]>, <[mode]>)
|
FILE *_fopen_r(<[reent]>, <[file]>, <[mode]>)
|
struct _reent *<[reent]>;
|
struct _reent *<[reent]>;
|
char *<[file]>;
|
char *<[file]>;
|
char *<[mode]>;
|
char *<[mode]>;
|
|
|
DESCRIPTION
|
DESCRIPTION
|
<<fopen>> initializes the data structures needed to read or write a
|
<<fopen>> initializes the data structures needed to read or write a
|
file. Specify the file's name as the string at <[file]>, and the kind
|
file. Specify the file's name as the string at <[file]>, and the kind
|
of access you need to the file with the string at <[mode]>.
|
of access you need to the file with the string at <[mode]>.
|
|
|
The alternate function <<_fopen_r>> is a reentrant version.
|
The alternate function <<_fopen_r>> is a reentrant version.
|
The extra argument <[reent]> is a pointer to a reentrancy structure.
|
The extra argument <[reent]> is a pointer to a reentrancy structure.
|
|
|
Three fundamental kinds of access are available: read, write, and append.
|
Three fundamental kinds of access are available: read, write, and append.
|
<<*<[mode]>>> must begin with one of the three characters `<<r>>',
|
<<*<[mode]>>> must begin with one of the three characters `<<r>>',
|
`<<w>>', or `<<a>>', to select one of these:
|
`<<w>>', or `<<a>>', to select one of these:
|
|
|
o+
|
o+
|
o r
|
o r
|
Open the file for reading; the operation will fail if the file does
|
Open the file for reading; the operation will fail if the file does
|
not exist, or if the host system does not permit you to read it.
|
not exist, or if the host system does not permit you to read it.
|
|
|
o w
|
o w
|
Open the file for writing @emph{from the beginning} of the file:
|
Open the file for writing @emph{from the beginning} of the file:
|
effectively, this always creates a new file. If the file whose name you
|
effectively, this always creates a new file. If the file whose name you
|
specified already existed, its old contents are discarded.
|
specified already existed, its old contents are discarded.
|
|
|
o a
|
o a
|
Open the file for appending data, that is writing from the end of
|
Open the file for appending data, that is writing from the end of
|
file. When you open a file this way, all data always goes to the
|
file. When you open a file this way, all data always goes to the
|
current end of file; you cannot change this using <<fseek>>.
|
current end of file; you cannot change this using <<fseek>>.
|
o-
|
o-
|
|
|
Some host systems distinguish between ``binary'' and ``text'' files.
|
Some host systems distinguish between ``binary'' and ``text'' files.
|
Such systems may perform data transformations on data written to, or
|
Such systems may perform data transformations on data written to, or
|
read from, files opened as ``text''.
|
read from, files opened as ``text''.
|
If your system is one of these, then you can append a `<<b>>' to any
|
If your system is one of these, then you can append a `<<b>>' to any
|
of the three modes above, to specify that you are opening the file as
|
of the three modes above, to specify that you are opening the file as
|
a binary file (the default is to open the file as a text file).
|
a binary file (the default is to open the file as a text file).
|
|
|
`<<rb>>', then, means ``read binary''; `<<wb>>', ``write binary''; and
|
`<<rb>>', then, means ``read binary''; `<<wb>>', ``write binary''; and
|
`<<ab>>', ``append binary''.
|
`<<ab>>', ``append binary''.
|
|
|
To make C programs more portable, the `<<b>>' is accepted on all
|
To make C programs more portable, the `<<b>>' is accepted on all
|
systems, whether or not it makes a difference.
|
systems, whether or not it makes a difference.
|
|
|
Finally, you might need to both read and write from the same file.
|
Finally, you might need to both read and write from the same file.
|
You can also append a `<<+>>' to any of the three modes, to permit
|
You can also append a `<<+>>' to any of the three modes, to permit
|
this. (If you want to append both `<<b>>' and `<<+>>', you can do it
|
this. (If you want to append both `<<b>>' and `<<+>>', you can do it
|
in either order: for example, <<"rb+">> means the same thing as
|
in either order: for example, <<"rb+">> means the same thing as
|
<<"r+b">> when used as a mode string.)
|
<<"r+b">> when used as a mode string.)
|
|
|
Use <<"r+">> (or <<"rb+">>) to permit reading and writing anywhere in
|
Use <<"r+">> (or <<"rb+">>) to permit reading and writing anywhere in
|
an existing file, without discarding any data; <<"w+">> (or <<"wb+">>)
|
an existing file, without discarding any data; <<"w+">> (or <<"wb+">>)
|
to create a new file (or begin by discarding all data from an old one)
|
to create a new file (or begin by discarding all data from an old one)
|
that permits reading and writing anywhere in it; and <<"a+">> (or
|
that permits reading and writing anywhere in it; and <<"a+">> (or
|
<<"ab+">>) to permit reading anywhere in an existing file, but writing
|
<<"ab+">>) to permit reading anywhere in an existing file, but writing
|
only at the end.
|
only at the end.
|
|
|
RETURNS
|
RETURNS
|
<<fopen>> returns a file pointer which you can use for other file
|
<<fopen>> returns a file pointer which you can use for other file
|
operations, unless the file you requested could not be opened; in that
|
operations, unless the file you requested could not be opened; in that
|
situation, the result is <<NULL>>. If the reason for failure was an
|
situation, the result is <<NULL>>. If the reason for failure was an
|
invalid string at <[mode]>, <<errno>> is set to <<EINVAL>>.
|
invalid string at <[mode]>, <<errno>> is set to <<EINVAL>>.
|
|
|
PORTABILITY
|
PORTABILITY
|
<<fopen>> is required by ANSI C.
|
<<fopen>> is required by ANSI C.
|
|
|
Supporting OS subroutines required: <<close>>, <<fstat>>, <<isatty>>,
|
Supporting OS subroutines required: <<close>>, <<fstat>>, <<isatty>>,
|
<<lseek>>, <<open>>, <<read>>, <<sbrk>>, <<write>>.
|
<<lseek>>, <<open>>, <<read>>, <<sbrk>>, <<write>>.
|
*/
|
*/
|
|
|
#if defined(LIBC_SCCS) && !defined(lint)
|
#if defined(LIBC_SCCS) && !defined(lint)
|
static char sccsid[] = "%W% (Berkeley) %G%";
|
static char sccsid[] = "%W% (Berkeley) %G%";
|
#endif /* LIBC_SCCS and not lint */
|
#endif /* LIBC_SCCS and not lint */
|
|
|
#include <_ansi.h>
|
#include <_ansi.h>
|
#include <reent.h>
|
#include <reent.h>
|
#include <stdio.h>
|
#include <stdio.h>
|
#include <errno.h>
|
#include <errno.h>
|
#include <sys/lock.h>
|
#include <sys/lock.h>
|
#ifdef __CYGWIN__
|
#ifdef __CYGWIN__
|
#include <fcntl.h>
|
#include <fcntl.h>
|
#endif
|
#endif
|
#include "local.h"
|
#include "local.h"
|
|
|
FILE *
|
FILE *
|
_DEFUN(_fopen_r, (ptr, file, mode),
|
_DEFUN(_fopen_r, (ptr, file, mode),
|
struct _reent *ptr _AND
|
struct _reent *ptr _AND
|
_CONST char *file _AND
|
_CONST char *file _AND
|
_CONST char *mode)
|
_CONST char *mode)
|
{
|
{
|
register FILE *fp;
|
register FILE *fp;
|
register int f;
|
register int f;
|
int flags, oflags;
|
int flags, oflags;
|
|
|
if ((flags = __sflags (ptr, mode, &oflags)) == 0)
|
if ((flags = __sflags (ptr, mode, &oflags)) == 0)
|
return NULL;
|
return NULL;
|
if ((fp = __sfp (ptr)) == NULL)
|
if ((fp = __sfp (ptr)) == NULL)
|
return NULL;
|
return NULL;
|
|
|
if ((f = _open_r (ptr, file, oflags, 0666)) < 0)
|
if ((f = _open_r (ptr, file, oflags, 0666)) < 0)
|
{
|
{
|
__sfp_lock_acquire ();
|
__sfp_lock_acquire ();
|
fp->_flags = 0; /* release */
|
fp->_flags = 0; /* release */
|
#ifndef __SINGLE_THREAD__
|
#ifndef __SINGLE_THREAD__
|
__lock_close_recursive (fp->_lock);
|
__lock_close_recursive (fp->_lock);
|
#endif
|
#endif
|
__sfp_lock_release ();
|
__sfp_lock_release ();
|
return NULL;
|
return NULL;
|
}
|
}
|
|
|
_flockfile (fp);
|
_flockfile (fp);
|
|
|
fp->_file = f;
|
fp->_file = f;
|
fp->_flags = flags;
|
fp->_flags = flags;
|
fp->_cookie = (_PTR) fp;
|
fp->_cookie = (_PTR) fp;
|
fp->_read = __sread;
|
fp->_read = __sread;
|
fp->_write = __swrite;
|
fp->_write = __swrite;
|
fp->_seek = __sseek;
|
fp->_seek = __sseek;
|
fp->_close = __sclose;
|
fp->_close = __sclose;
|
|
|
if (fp->_flags & __SAPP)
|
if (fp->_flags & __SAPP)
|
_fseek_r (ptr, fp, 0, SEEK_END);
|
_fseek_r (ptr, fp, 0, SEEK_END);
|
|
|
#ifdef __SCLE
|
#ifdef __SCLE
|
if (__stextmode (fp->_file))
|
if (__stextmode (fp->_file))
|
fp->_flags |= __SCLE;
|
fp->_flags |= __SCLE;
|
#endif
|
#endif
|
|
|
_funlockfile (fp);
|
_funlockfile (fp);
|
return fp;
|
return fp;
|
}
|
}
|
|
|
#ifndef _REENT_ONLY
|
#ifndef _REENT_ONLY
|
|
|
FILE *
|
FILE *
|
_DEFUN(fopen, (file, mode),
|
_DEFUN(fopen, (file, mode),
|
_CONST char *file _AND
|
_CONST char *file _AND
|
_CONST char *mode)
|
_CONST char *mode)
|
{
|
{
|
return _fopen_r (_REENT, file, mode);
|
return _fopen_r (_REENT, file, mode);
|
}
|
}
|
|
|
#endif
|
#endif
|
|
|
